TypeScript

Types for the JavaScript you already write: the concepts interviews ask about. Every page takes about five minutes: one situation, one visual, runnable code with real compiler feedback, and the questions you'll hear across the table.

Start hereCopy Anchor Link

1. Why TypeScript exists and who uses it.
2. How TypeScript works.
3. Pros and cons, and when not to use it.

BasicsCopy Anchor Link

Short pages on basic types, objects, functions, unions and narrowing, generics, enums, classes, utility types, any versus unknown, modules and tsconfig — the half of every TypeScript interview.

Real life and interview prepCopy Anchor Link

Typing a React component and its API call, migrating a JavaScript project — then the question bank with every question searchable, twelve "will it compile" puzzles, nine type challenges, and a one-page cheat sheet.

How to use this topicCopy Anchor Link

You already know JavaScript — start from the JavaScript topic whenever a page links back to it. Read a page in five minutes: situation first, visual second, then check the types and run the code. Guess every puzzle before revealing. Finish with the bank filtered to your weak topics.

ReferencesCopy Anchor Link

• TypeScript Handbook.
• TypeScript release notes.